<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <style>
        div{
            width: 100px;
            height: 50px;
            background: red;
            border-radius: 100px 100px 0 0;
        }
    </style>

</head>
<body>


<div></div>


</body>
</html>